Mix graham cracker crumbs and margarine together. Press firmly onto bottom of a 9 inch square pan. Beat ice cream and lemonade concentrate together in a large bowl, with electric mixer on medium speed until well blended; spread over crust. Freeze 4 hours or until firm. Cut into 9 squares to serve. Top each square with a dollop of Cool Whip; garnish each square with a fresh strawberry to top Cool Whip. Makes 9 servings.